US20100259014A1 - Sealing device - Google Patents
Sealing device Download PDFInfo
- Publication number
- US20100259014A1 US20100259014A1 US12/680,101 US68010108A US2010259014A1 US 20100259014 A1 US20100259014 A1 US 20100259014A1 US 68010108 A US68010108 A US 68010108A US 2010259014 A1 US2010259014 A1 US 2010259014A1
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- US
- United States
- Prior art keywords
- oil seal
- section
- lip
- peripheral surface
- slinger
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3248—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports
- F16J15/3252—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports with rigid casings or supports
- F16J15/3256—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports with rigid casings or supports comprising two casing or support elements, one attached to each surface, e.g. cartridge or cassette seals
- F16J15/3264—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports with rigid casings or supports comprising two casing or support elements, one attached to each surface, e.g. cartridge or cassette seals the elements being separable from each other
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
- F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
- F16C19/06—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or balls
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2326/00—Articles relating to transporting
- F16C2326/01—Parts of vehicles in general
- F16C2326/02—Wheel hubs or castors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2326/00—Articles relating to transporting
- F16C2326/01—Parts of vehicles in general
- F16C2326/06—Drive shafts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
- F16C33/7869—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward
- F16C33/7873—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a single sealing ring of generally L-shaped cross-section
- F16C33/7876—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a single sealing ring of generally L-shaped cross-section with sealing lips
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
- F16C33/7896—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members with two or more discrete sealings arranged in series
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/80—Labyrinth sealings
- F16C33/805—Labyrinth sealings in addition to other sealings, e.g. dirt guards to protect sealings with sealing lips
Definitions
- the present invention relates to a sealing device sealing a shaft periphery and the like of a portion which tends to be exposed to a muddy water or the like from an external portion, such as a transfer apparatus, a wheel bearing apparatus and the like of a vehicle, and more particularly to a sealing device provided with a structure preventing the muddy water or the like from making an intrusion into a sliding section of an oil seal lip.
- FIG. 2 is a half sectional view of an installed state and shows an example of this kind of sealing device in accordance with a conventional art by cuffing along a plane passing through an axis O.
- reference numeral 2 denotes a housing of a transfer apparatus
- reference numeral 3 denotes a rotating shaft which is inserted to the housing 2 and is supported in a state of being rotatable around an axis O via a bearing 4
- reference numeral 5 denotes a sleeve which is spline fitted to an outer periphery of the rotating shaft 3 and is fixed by a nut 6
- reference numeral 7 denotes a packing which seals between the rotating shaft 3 and the sleeve 5
- a companion flange 5 a formed at an end portion of the sleeve 5 is connected to a propeller shaft (not shown) or the like.
- a sealing device 100 is provided with a non-rotating oil seal 110 which is positioned at an outer side in an axial direction of the bearing 4 and is attached to an inner periphery of the housing 2 , and a slinger 120 which is positioned at an outer side in an axial direction of the oil seal 110 , is attached to an outer periphery of the sleeve 5 , and is rotated integrally with the rotating shaft 3 and the sleeve 5 .
- the oil seal 110 has an oil seal lip 111 which extends toward the bearing 4 side, and a side lip 112 which extends toward an opposite side (an outer side) to the oil seal lip 111 .
- the oil seal lip 111 is structured such as to prevent a lubricating oil fed to the bearing 4 from leaking by being slidably brought into close contact with an outer peripheral surface of the sleeve 5
- the side lip 112 is structured such as to prevent a muddy water or the like coming in from an external portion A from making an intrusion into the oil seal lip 111 side by being slidably brought into close contact with a flange section 121 of the slinger 120 .
- the slinger 120 itself has a throwing off action on the basis of centrifugal force generated in the flange section 121 , and achieves an improvement of an effect of preventing the muddy water or the like from making an intrusion, by making an outer tube section 122 thereof to be near to an end portion of the housing 2 (refer, for example, to the following patent documents 1 to 3), or providing a conical tubular dust lip, in which a leading end has a large diameter, on a radially outer end portion of the slinger 120 and bringing it slidably into close contact with a radially outer edge portion of the housing 2 (refer, for example, to the following Japanese Utility Model Publication No. 7-33017).
- Japanese Unexamined Patent Publication No. 2006-9930 Japanese Unexamined Utility Model Publication No. 5-54871, Japanese Unexamined Utility Model Publication No. 3-67765, and Japanese Utility Model Publication No. 7-33017.
- the sealing device in which the radially outer end portion of the slinger 120 is provided with the conical tubular dust lip in which the leading end has the large diameter as shown in patent document 4 since a body portion of the dust lip comes into close contact with a radially outer edge of an opening end of the housing 2 , it is not possible to obtain a sufficient fastening margin with respect to the housing 2 , and particularly in the case that the sealing device is submerged in the muddy water at a time of traveling on a punishing road, it is hard to inhibit the muddy water from making an intrusion.
- the present invention is made by taking the points mentioned above into consideration, and a technical object of the present invention is to provide a structure which can prevent muddy water or the like from making an intrusion into a sliding section of an oil seal lip as much as possible, in a sealing device sealing a periphery of a shaft or the like of a portion which tends to be exposed to the muddy water or the like from an external portion.
- a sealing device comprising:
- a slinger attached to a rotating body inserted to the housing so as to be positioned at an axially outer side of the oil seal;
- the oil seal being integrally formed by a rubber-like elastic material on a reinforcement ring constructed by a metal press molded product
- an oil seal lip slidably brought into close contact with an outer peripheral surface of the rotating body and a side lip slidably brought into close contact with the slinger are formed, a sliding tube section exposed from the rubber-like elastic material and positioned at a radially outer side of a sliding section of the side lip is formed on the reinforcement ring, and an external seal lip provided on a radially outer section of the slinger is slidably brought into close contact with an outer peripheral surface of the sliding tube section.
- the external seal lip is formed in such a shape that a leading end is bent so as to be directed to an inner peripheral side.
- the sealing device since the external seal lip provided on the radially outer section of the slinger is slid in a close contact manner with the sliding tube section extended from the reinforcement ring, it is possible to effectively prevent a muddy water from making an intrusion into the sliding section of the side lip and further into the sliding section side of the oil seal lip.
- the sliding tube section slidably coming into close contact with the external seal lip is extended from the reinforcement ring constructed by the metal press molded product, the outer peripheral surface of the sliding tube section is smooth. Accordingly, a sliding torque of the external seal lip is held down, and an excellent muddy water sealing performance can be obtained. Further, it is not necessary to apply an additional work for reducing a surface roughness to an outer peripheral surface of the sliding tube section, as is different from the case that the external seal lip is slidably brought into close contact with the outer peripheral surface of the opening end of the housing.
- the external seal lip is formed in such a shape that the leading end is bent so as to be directed to the inner peripheral side, it is possible to set a sufficient fastening margin of the external seal lip with respect to the outer peripheral surface of the sliding tube section of the reinforcement ring at a time when the rotating body is rotated at a low speed, and the fastening margin of the external seal lip with respect to the outer peripheral surface of the sliding tube section is significantly lowered at a time of rotating at a high speed. Accordingly, it is possible to suppress sliding torque, heat generation and an abrasion.
- FIG. 1 is a half sectional view of an installed state, and shows a preferable embodiment of a sealing device in accordance with the present invention by cutting along a plane passing through an axis O;
- FIG. 2 is a half sectional view of an installed state, and shows an example of a sealing device in accordance with a conventional art by cutting along a plane passing through an axis O.
- FIG. 1 is a half sectional view of an installed state, and shows a preferable embodiment of the sealing device in accordance with the present invention by cutting along a plane passing through an axis O.
- reference numeral 2 denotes a non-rotating housing in a transfer apparatus of a vehicle
- reference numeral 3 denotes a rotating shaft inserted to the housing 2 and supported in a state of being rotatable around an axis O via a bearing 4
- reference numeral 5 denotes a sleeve positioned close to an inner peripheral side of an opening end 2 a of the housing 2 so as to be outside inserted to the rotating shaft 3 .
- the rotating shaft 3 and the sleeve 5 correspond to the rotating body described above in the first aspect.
- the sleeve 5 is structured such that a spline section 5 b which is formed on an inner peripheral surface thereof is fitted to a spline section 3 a which is formed on an outer peripheral surface of the rotating shaft 3 , and is fixed in an axial direction by a nut 6 , which is positioned at an outer side in an axial direction and is engaged with a male thread section 3 b formed on an outer peripheral surface of the rotating shaft 3 , in a state that an end is brought into contact with an inner ring 4 a of the bearing 4 .
- a portion between the rotating shaft 3 and the sleeve 5 is sealed by a packing 7 , which is interposed at a position axially outside the fitted portion of the spline sections 3 a and 5 b , and is prevented by the nut 6 from coming off.
- a companion flange 5 a is formed on an outer end portion of the sleeve 5 , and is connected to a propeller shaft (not shown) or the like.
- Reference numeral 1 denotes a sealing device in accordance with the present invention.
- the sealing device 1 is provided with an oil seal 10 which is attached to an inner peripheral surface of the opening end 2 a of the housing 2 , and a slinger 20 which is attached to an outer peripheral surface of the sleeve 5 outside inserted to the rotating shaft 3 in a state of being positioned at an axially outer side of the oil seal 10 .
- the oil seal 10 is integrally formed by a rubber-like elastic material on a reinforcement ring 11 which is manufactured by punch press molding of a metal plate, and is provided with an outer peripheral seal section 12 which is pressure inserted and fitted to the inner peripheral surface of the opening end 2 a of the housing 2 , an oil seal lip 13 which extends to the bearing 4 side from a radially inner position of the reinforcement ring 11 and is slidably brought into close contact with the outer peripheral surface of the sleeve 5 by an inner peripheral portion in the vicinity of a leading end thereof, a dust lip 14 which extends to an opposite side to the oil seal lip 13 from the radially inner position of the reinforcement ring 11 and is opposed in a close contact manner to or is slidably brought into close contact with the outer peripheral surface of the sleeve 5 by a leading end inner periphery thereof, and a side lip 15 which extends to an opposite side to the oil seal lip 13 from an outer peripheral side of a root of the dust lip 14 and extends so as to form such
- a radially outer flange section 11 a and a sliding tube section 11 b which are exposed from the outer peripheral seal section 12 made of a rubber-like elastic material, are provided at a radially outer section of the reinforcement ring 11 of the oil seal 10 .
- the radially outer flange section 11 a of the reinforcement ring 11 extends to a radially outer side along an end most of the opening end 2 a of the housing 2 , and the sliding tube section 11 b bent to an opposite side to the slinger 20 from a radially outer end portion thereof so as to extend in a cylindrical shape is outside inserted to the opening end 2 a.
- the slinger 20 is manufactured by punch press molding of a metal plate, and has an radially inner tube section 21 which is pressure inserted and fitted to the outer peripheral surface of the sleeve 5 , and a seal flange section 22 which expands in a disc shape in a radially outer direction from the radially inner tube section 21 so as to be slidably brought into close contact with the leading end portion of the side lip 15 of the oil seal 10 .
- An outer diameter of the seal flange section 22 of the slinger 20 is larger than an outer diameter of the opening end 2 a of the housing 2 , and an external seal lip 23 made of a rubber-like elastic material is integrally provided on a radially outer section 22 a of the seal flange section 22 .
- the external seal lip 23 is vulcanization bonded to the radially outer section 22 a of the seal flange section 22 by a root 23 a thereof, is formed to have such a sectional shape as to be bent at a lumbar part 23 b so as to incline to an inner peripheral side, and is structured such that a leading end portion 23 c is slidably brought into contact with an outer peripheral surface of the sliding tube section 11 b of the reinforcement ring 11 which is closely fitted to the outer peripheral surface of the opening end 2 a of the housing 2 at a radially outer side of a sliding section S 2 of the side lip 15 of the oil seal 10 with respect to the seal flange section 22 , thereby forming a sliding section S 3 .
- the oil seal 10 is positioned and fixed to the housing 2 in such a manner as to achieve a state that the radially outer flange section 11 a of the reinforcement ring 11 comes into contact with the end most of the opening end 2 a , by pressure inserting the outer peripheral seal section 12 , in which the reinforcement ring 11 is embedded, to the inner peripheral surface of the opening end 2 a of the housing 2 , and by outside inserting the sliding tube section 11 b of the reinforcement ring 11 to the opening end 2 a .
- the slinger 20 is positioned and fixed to the sleeve 5 by pressure inserting and fitting the radially inner tube section 21 to the outer peripheral surface of the sleeve 5 and by bringing the radially inner tube section 21 into contact with a step surface 5 c formed in the outer peripheral surface of the sleeve 5 , and the sleeve 5 is outside inserted to the rotating shaft 3 so as to be fixed, whereby an illustrated installed state is achieved.
- the oil seal lip 13 of the oil seal 10 is structured such as to prevent a lubricating oil fed to the bearing 4 from leaking to an external portion A from the outer periphery of the sleeve 5 , at a sliding section S 1 with the outer peripheral surface of the sleeve 5 .
- the side lip 15 of the oil seal 10 is structured such as to block an intrusion of muddy water or the like into an inner peripheral side on the basis of a throwing off operation of the seal flange section 22 caused by a close contact sliding motion with the seal flange section 22 and centrifugal force, at the sliding section S 2 with the seal flange section 22 of the rotating slinger 20
- the dust lip 14 of the oil seal 10 is structured such as to block an intrusion of muddy water or the like into the oil seal lip 13 side by being opposed in a close contact manner to or being slidably brought into close contact with the outer peripheral surface of the sleeve 5 at an inner peripheral side of the side lip 15 .
- the external seal lip 23 is formed in such a shaped as to be bent to the inner peripheral side at the lumbar part 23 b , whereby it is possible to set a sufficient fastening margin with respect to the outer peripheral surface of the sliding tube section 11 b .
- the reinforcement ring 11 is manufactured by punch press molding of the metal plate, and the outer peripheral surface of the sliding tube section 11 b is sufficiently smooth in comparison with the outer peripheral surface of the opening end 2 a of the housing 2 constructed by a cast product. Therefore, it is possible to obtain an excellent muddy water sealing performance without applying any additional work for reducing a surface roughness, and a sliding torque can be held down sufficiently.
- centrifugal force acts on the external seal lip 23 rotating together with the slinger 20 in a direction of opening from the outer peripheral surface of the sliding tube section 11 b of the reinforcement ring 11 , however, for example, in such a case that a vehicle travels in a state that a whole of an illustrated portion is submerged into muddy water, a vehicle speed slows down, that is, a rotating speed of the rotating shaft 3 becomes low. Accordingly, the centrifugal force as mentioned above becomes small, and then the fastening margin of the external seal lip 23 with respect to the outer peripheral surface of the sliding tube section 11 b of the reinforcement ring 11 is increased, whereby the muddy water sealing performance is enhanced. Further, since the rotating speed of the rotating shaft 3 is low, an influence given to the sliding torque caused by the increase of the fastening margin becomes small.
- the rotating speed of the rotating shaft 3 becomes higher at a time of traveling at a high speed in a state that the illustrated portion is not submerged in muddy water, the centrifugal force acting on the external seal lip 23 becomes larger, and the fastening margin with respect to the outer peripheral surface of the sliding tube section lib of the reinforcement ring 11 is lowered. Accordingly, it is possible to effectively suppress rising of the sliding torque caused by the increase of the rotating speed, heat generation and an abrasion.
Abstract
Description
- This is a national stage of International Application No. PCT/JP2008/071836 filed on Dec. 2, 2008 and published in the Japanese language. This application claims the benefit of Japanese Application No. 2007-320508, filed on Dec. 12, 2007. The disclosures of the above applications are incorporated herein by reference.
- 1. Field of the Invention
- The present invention relates to a sealing device sealing a shaft periphery and the like of a portion which tends to be exposed to a muddy water or the like from an external portion, such as a transfer apparatus, a wheel bearing apparatus and the like of a vehicle, and more particularly to a sealing device provided with a structure preventing the muddy water or the like from making an intrusion into a sliding section of an oil seal lip.
- 2. Description of the Conventional Art
- In a sealing device used for a transfer apparatus, a wheel bearing apparatus and the like of a vehicle, since a muddy water or the like tends to come in from an external portion, it is necessary to inhibit the muddy water or the like from making an intrusion into a sliding section of an oil seal lip as much as possible, thereby preventing a reduction of a sealing performance of the oil seal lip as much as possible.
FIG. 2 is a half sectional view of an installed state and shows an example of this kind of sealing device in accordance with a conventional art by cuffing along a plane passing through an axis O. - In particular, in
FIG. 2 ,reference numeral 2 denotes a housing of a transfer apparatus,reference numeral 3 denotes a rotating shaft which is inserted to thehousing 2 and is supported in a state of being rotatable around an axis O via a bearing 4, reference numeral 5 denotes a sleeve which is spline fitted to an outer periphery of the rotatingshaft 3 and is fixed by anut 6, andreference numeral 7 denotes a packing which seals between the rotatingshaft 3 and the sleeve 5. Acompanion flange 5 a formed at an end portion of the sleeve 5 is connected to a propeller shaft (not shown) or the like. - A
sealing device 100 is provided with anon-rotating oil seal 110 which is positioned at an outer side in an axial direction of the bearing 4 and is attached to an inner periphery of thehousing 2, and aslinger 120 which is positioned at an outer side in an axial direction of theoil seal 110, is attached to an outer periphery of the sleeve 5, and is rotated integrally with the rotatingshaft 3 and the sleeve 5. - Describing in detail, the
oil seal 110 has anoil seal lip 111 which extends toward the bearing 4 side, and aside lip 112 which extends toward an opposite side (an outer side) to theoil seal lip 111. Theoil seal lip 111 is structured such as to prevent a lubricating oil fed to the bearing 4 from leaking by being slidably brought into close contact with an outer peripheral surface of the sleeve 5, and theside lip 112 is structured such as to prevent a muddy water or the like coming in from an external portion A from making an intrusion into theoil seal lip 111 side by being slidably brought into close contact with aflange section 121 of theslinger 120. Theslinger 120 itself has a throwing off action on the basis of centrifugal force generated in theflange section 121, and achieves an improvement of an effect of preventing the muddy water or the like from making an intrusion, by making anouter tube section 122 thereof to be near to an end portion of the housing 2 (refer, for example, to the followingpatent documents 1 to 3), or providing a conical tubular dust lip, in which a leading end has a large diameter, on a radially outer end portion of theslinger 120 and bringing it slidably into close contact with a radially outer edge portion of the housing 2 (refer, for example, to the following Japanese Utility Model Publication No. 7-33017). - Reference is made to Japanese Unexamined Patent Publication No. 2006-9930, Japanese Unexamined Utility Model Publication No. 5-54871, Japanese Unexamined Utility Model Publication No. 3-67765, and Japanese Utility Model Publication No. 7-33017.
- However, in accordance with the
sealing device 100 as shown inFIG. 2 (refer to Japanese Unexamined Patent Publication No. 2006-9930, Japanese Unexamined Utility Model Publication No. 5-54871 and Japanese Unexamined Utility Model Publication No. 3-67765), if a gap between theouter tube section 122 of theslinger 120 and the outer peripheral surface of the end portion of thehousing 2 is made small, there is a risk that theouter tube section 122 comes into contact with the outer peripheral surface of the end portion of thehousing 2 on the basis of a working tolerance, an eccentricity of therotating shaft 3 or the like, so that it is not possible to make the gap sufficiently small. Therefore, it is impossible to sufficiently prevent the muddy water or the like from making an intrusion. - Further, as for the sealing device in which the radially outer end portion of the
slinger 120 is provided with the conical tubular dust lip in which the leading end has the large diameter as shown in patent document 4, since a body portion of the dust lip comes into close contact with a radially outer edge of an opening end of thehousing 2, it is not possible to obtain a sufficient fastening margin with respect to thehousing 2, and particularly in the case that the sealing device is submerged in the muddy water at a time of traveling on a punishing road, it is hard to inhibit the muddy water from making an intrusion. Further, in order to improve a muddy water sealing performance, there can be considered to increase the number of theside lip 112 and the dust lip, however, in this case, not only thesealing device 100 is enlarged in size, but also there is a risk that a specific fuel consumption is lowered by an increase of sliding torque. - The present invention is made by taking the points mentioned above into consideration, and a technical object of the present invention is to provide a structure which can prevent muddy water or the like from making an intrusion into a sliding section of an oil seal lip as much as possible, in a sealing device sealing a periphery of a shaft or the like of a portion which tends to be exposed to the muddy water or the like from an external portion.
- As a means for effectively solving the technical problem mentioned above, in accordance with an aspect of the present invention, there is provided a sealing device comprising:
- an oil seal attached to an inner peripheral surface of an opening end of a non-rotating housing; and
- a slinger attached to a rotating body inserted to the housing so as to be positioned at an axially outer side of the oil seal;
- the oil seal being integrally formed by a rubber-like elastic material on a reinforcement ring constructed by a metal press molded product,
- wherein an oil seal lip slidably brought into close contact with an outer peripheral surface of the rotating body and a side lip slidably brought into close contact with the slinger are formed, a sliding tube section exposed from the rubber-like elastic material and positioned at a radially outer side of a sliding section of the side lip is formed on the reinforcement ring, and an external seal lip provided on a radially outer section of the slinger is slidably brought into close contact with an outer peripheral surface of the sliding tube section.
- As another more preferable example of the structure mentioned above, the external seal lip is formed in such a shape that a leading end is bent so as to be directed to an inner peripheral side.
- In accordance with the sealing device on the basis of the present invention, since the external seal lip provided on the radially outer section of the slinger is slid in a close contact manner with the sliding tube section extended from the reinforcement ring, it is possible to effectively prevent a muddy water from making an intrusion into the sliding section of the side lip and further into the sliding section side of the oil seal lip.
- Further, since the sliding tube section slidably coming into close contact with the external seal lip is extended from the reinforcement ring constructed by the metal press molded product, the outer peripheral surface of the sliding tube section is smooth. Accordingly, a sliding torque of the external seal lip is held down, and an excellent muddy water sealing performance can be obtained. Further, it is not necessary to apply an additional work for reducing a surface roughness to an outer peripheral surface of the sliding tube section, as is different from the case that the external seal lip is slidably brought into close contact with the outer peripheral surface of the opening end of the housing.
- Further, if the external seal lip is formed in such a shape that the leading end is bent so as to be directed to the inner peripheral side, it is possible to set a sufficient fastening margin of the external seal lip with respect to the outer peripheral surface of the sliding tube section of the reinforcement ring at a time when the rotating body is rotated at a low speed, and the fastening margin of the external seal lip with respect to the outer peripheral surface of the sliding tube section is significantly lowered at a time of rotating at a high speed. Accordingly, it is possible to suppress sliding torque, heat generation and an abrasion.
-
FIG. 1 is a half sectional view of an installed state, and shows a preferable embodiment of a sealing device in accordance with the present invention by cutting along a plane passing through an axis O; and -
FIG. 2 is a half sectional view of an installed state, and shows an example of a sealing device in accordance with a conventional art by cutting along a plane passing through an axis O. - A description will be given below of an embodiment of a sealing device in accordance with the present invention with reference to the accompanying drawings.
FIG. 1 is a half sectional view of an installed state, and shows a preferable embodiment of the sealing device in accordance with the present invention by cutting along a plane passing through an axis O. - In this
FIG. 1 ,reference numeral 2 denotes a non-rotating housing in a transfer apparatus of a vehicle,reference numeral 3 denotes a rotating shaft inserted to thehousing 2 and supported in a state of being rotatable around an axis O via a bearing 4, and reference numeral 5 denotes a sleeve positioned close to an inner peripheral side of anopening end 2 a of thehousing 2 so as to be outside inserted to the rotatingshaft 3. In this case, therotating shaft 3 and the sleeve 5 correspond to the rotating body described above in the first aspect. - The sleeve 5 is structured such that a
spline section 5 b which is formed on an inner peripheral surface thereof is fitted to aspline section 3 a which is formed on an outer peripheral surface of the rotatingshaft 3, and is fixed in an axial direction by anut 6, which is positioned at an outer side in an axial direction and is engaged with amale thread section 3 b formed on an outer peripheral surface of the rotatingshaft 3, in a state that an end is brought into contact with aninner ring 4 a of the bearing 4. A portion between the rotatingshaft 3 and the sleeve 5 is sealed by apacking 7, which is interposed at a position axially outside the fitted portion of thespline sections nut 6 from coming off. Further, acompanion flange 5 a is formed on an outer end portion of the sleeve 5, and is connected to a propeller shaft (not shown) or the like. -
Reference numeral 1 denotes a sealing device in accordance with the present invention. Thesealing device 1 is provided with anoil seal 10 which is attached to an inner peripheral surface of theopening end 2 a of thehousing 2, and aslinger 20 which is attached to an outer peripheral surface of the sleeve 5 outside inserted to the rotatingshaft 3 in a state of being positioned at an axially outer side of theoil seal 10. - The
oil seal 10 is integrally formed by a rubber-like elastic material on areinforcement ring 11 which is manufactured by punch press molding of a metal plate, and is provided with an outerperipheral seal section 12 which is pressure inserted and fitted to the inner peripheral surface of theopening end 2 a of thehousing 2, anoil seal lip 13 which extends to the bearing 4 side from a radially inner position of thereinforcement ring 11 and is slidably brought into close contact with the outer peripheral surface of the sleeve 5 by an inner peripheral portion in the vicinity of a leading end thereof, a dust lip 14 which extends to an opposite side to theoil seal lip 13 from the radially inner position of thereinforcement ring 11 and is opposed in a close contact manner to or is slidably brought into close contact with the outer peripheral surface of the sleeve 5 by a leading end inner periphery thereof, and aside lip 15 which extends to an opposite side to theoil seal lip 13 from an outer peripheral side of a root of the dust lip 14 and extends so as to form such a conical tubular shape that a leading end has a large diameter. Agarter spring 16 compensating a tension force is fitly attached to theoil seal lip 13. - A radially
outer flange section 11 a and asliding tube section 11 b, which are exposed from the outerperipheral seal section 12 made of a rubber-like elastic material, are provided at a radially outer section of thereinforcement ring 11 of theoil seal 10. Describing in detail, the radiallyouter flange section 11 a of thereinforcement ring 11 extends to a radially outer side along an end most of theopening end 2 a of thehousing 2, and thesliding tube section 11 b bent to an opposite side to theslinger 20 from a radially outer end portion thereof so as to extend in a cylindrical shape is outside inserted to theopening end 2 a. - Meanwhile, the
slinger 20 is manufactured by punch press molding of a metal plate, and has an radiallyinner tube section 21 which is pressure inserted and fitted to the outer peripheral surface of the sleeve 5, and aseal flange section 22 which expands in a disc shape in a radially outer direction from the radiallyinner tube section 21 so as to be slidably brought into close contact with the leading end portion of theside lip 15 of theoil seal 10. - An outer diameter of the
seal flange section 22 of theslinger 20 is larger than an outer diameter of theopening end 2 a of thehousing 2, and anexternal seal lip 23 made of a rubber-like elastic material is integrally provided on a radiallyouter section 22 a of theseal flange section 22. Theexternal seal lip 23 is vulcanization bonded to the radiallyouter section 22 a of theseal flange section 22 by aroot 23 a thereof, is formed to have such a sectional shape as to be bent at alumbar part 23 b so as to incline to an inner peripheral side, and is structured such that a leadingend portion 23 c is slidably brought into contact with an outer peripheral surface of thesliding tube section 11 b of thereinforcement ring 11 which is closely fitted to the outer peripheral surface of theopening end 2 a of thehousing 2 at a radially outer side of a sliding section S2 of theside lip 15 of theoil seal 10 with respect to theseal flange section 22, thereby forming a sliding section S3. - In the
sealing device 1 in accordance with the present invention constructed as mentioned above, theoil seal 10 is positioned and fixed to thehousing 2 in such a manner as to achieve a state that the radiallyouter flange section 11 a of thereinforcement ring 11 comes into contact with the end most of theopening end 2 a, by pressure inserting the outerperipheral seal section 12, in which thereinforcement ring 11 is embedded, to the inner peripheral surface of theopening end 2 a of thehousing 2, and by outside inserting thesliding tube section 11 b of thereinforcement ring 11 to theopening end 2 a. In this case, it is not necessary to closely fit thesliding tube section 11 b extended from thereinforcement ring 11 to the outer peripheral surface of theopening end 2 a of thehousing 2 in accordance with pressure insertion, and a clearance may exists between the outer peripheral surface of theopening end 2 a and thesliding tube section 11 b. On the other hand, theslinger 20 is positioned and fixed to the sleeve 5 by pressure inserting and fitting the radiallyinner tube section 21 to the outer peripheral surface of the sleeve 5 and by bringing the radiallyinner tube section 21 into contact with astep surface 5 c formed in the outer peripheral surface of the sleeve 5, and the sleeve 5 is outside inserted to the rotatingshaft 3 so as to be fixed, whereby an illustrated installed state is achieved. - The
oil seal lip 13 of theoil seal 10 is structured such as to prevent a lubricating oil fed to the bearing 4 from leaking to an external portion A from the outer periphery of the sleeve 5, at a sliding section S1 with the outer peripheral surface of the sleeve 5. Further, theside lip 15 of theoil seal 10 is structured such as to block an intrusion of muddy water or the like into an inner peripheral side on the basis of a throwing off operation of theseal flange section 22 caused by a close contact sliding motion with theseal flange section 22 and centrifugal force, at the sliding section S2 with theseal flange section 22 of the rotatingslinger 20, and the dust lip 14 of theoil seal 10 is structured such as to block an intrusion of muddy water or the like into theoil seal lip 13 side by being opposed in a close contact manner to or being slidably brought into close contact with the outer peripheral surface of the sleeve 5 at an inner peripheral side of theside lip 15. - Further, at the outside of the sliding sections of the
oil seal lip 13, the dust lip 14 and theside lip 15, since theexternal seal lip 23 rotating together with theslinger 20 is slidably brought into close contact with the outer peripheral surface of the slidingtube section 11 b of thereinforcement ring 11 which is closely fitted to the outer peripheral surface of the openingend 2 a of thehousing 2, and forms the sliding section S3, it is possible to effectively prevent the muddy water or the like coming in from the external portion A from making an intrusion into the sliding section S2 of theside lip 15. - Further, the
external seal lip 23 is formed in such a shaped as to be bent to the inner peripheral side at thelumbar part 23 b, whereby it is possible to set a sufficient fastening margin with respect to the outer peripheral surface of the slidingtube section 11 b. In addition thereinforcement ring 11 is manufactured by punch press molding of the metal plate, and the outer peripheral surface of the slidingtube section 11 b is sufficiently smooth in comparison with the outer peripheral surface of the openingend 2 a of thehousing 2 constructed by a cast product. Therefore, it is possible to obtain an excellent muddy water sealing performance without applying any additional work for reducing a surface roughness, and a sliding torque can be held down sufficiently. - In this case, centrifugal force acts on the
external seal lip 23 rotating together with theslinger 20 in a direction of opening from the outer peripheral surface of the slidingtube section 11 b of thereinforcement ring 11, however, for example, in such a case that a vehicle travels in a state that a whole of an illustrated portion is submerged into muddy water, a vehicle speed slows down, that is, a rotating speed of therotating shaft 3 becomes low. Accordingly, the centrifugal force as mentioned above becomes small, and then the fastening margin of theexternal seal lip 23 with respect to the outer peripheral surface of the slidingtube section 11 b of thereinforcement ring 11 is increased, whereby the muddy water sealing performance is enhanced. Further, since the rotating speed of therotating shaft 3 is low, an influence given to the sliding torque caused by the increase of the fastening margin becomes small. - Further, since the rotating speed of the
rotating shaft 3 becomes higher at a time of traveling at a high speed in a state that the illustrated portion is not submerged in muddy water, the centrifugal force acting on theexternal seal lip 23 becomes larger, and the fastening margin with respect to the outer peripheral surface of the sliding tube section lib of thereinforcement ring 11 is lowered. Accordingly, it is possible to effectively suppress rising of the sliding torque caused by the increase of the rotating speed, heat generation and an abrasion. - Further, even if muddy water or the like passing through the sliding section S3 of the
external seal lip 23 exists, an amount thereof is extremely small, and muddy water or the like mentioned above is prevented from making an intrusion into the inner peripheral side on the basis of the throwing off operation as described above, at the sliding section S2 between theside lip 15 and theseal flange section 22. Further, since the dust lip 14 exists at the inner side thereof, it is possible to effectively prevent an early abrasion caused by an interposition of muddy water or a foreign material in the sliding section Si between theoil seal lip 13 and the sleeve 5, and it is possible to maintain an excellent oil sealing performance.
Claims (2)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007320508A JP5218735B2 (en) | 2007-12-12 | 2007-12-12 | Sealing device |
JP2007-320508 | 2007-12-12 | ||
PCT/JP2008/071836 WO2009075199A1 (en) | 2007-12-12 | 2008-12-02 | Sealing device |
Publications (2)
Publication Number | Publication Date |
---|---|
US20100259014A1 true US20100259014A1 (en) | 2010-10-14 |
US8573601B2 US8573601B2 (en) | 2013-11-05 |
Family
ID=40755442
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/680,101 Expired - Fee Related US8573601B2 (en) | 2007-12-12 | 2008-12-02 | Sealing device |
Country Status (5)
Country | Link |
---|---|
US (1) | US8573601B2 (en) |
JP (1) | JP5218735B2 (en) |
CN (1) | CN101883941B (en) |
DE (1) | DE112008003600B4 (en) |
WO (1) | WO2009075199A1 (en) |
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US10458237B2 (en) * | 2015-10-22 | 2019-10-29 | Nidec Motor Corporation | Sealing sleeve for geared shaft of gearmotor assembly |
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Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110006485A1 (en) * | 2008-04-25 | 2011-01-13 | Nok Corporation | Sealing device |
EP2796754A4 (en) * | 2011-12-21 | 2015-07-22 | Nok Corp | Engine rear seal |
US9638329B2 (en) | 2011-12-21 | 2017-05-02 | Nok Corporation | Engine rear seal |
ITTO20130548A1 (en) * | 2013-07-01 | 2015-01-02 | Skf Ab | LOW FRICTION SEALING COMPLEX FOR A WHEEL HUB UNIT AND WHEEL HUB UNIT EQUIPPED WITH THIS SEALING COMPLEX |
EP2837507A1 (en) * | 2013-07-01 | 2015-02-18 | Aktiebolaget SKF | Hub bearing unit equipped with a low friction sealing assembly |
US9328771B2 (en) | 2013-07-01 | 2016-05-03 | Aktiebolaget Skf | Hub bearing unit equipped with a low friction sealing assembly |
US9511627B2 (en) * | 2014-10-23 | 2016-12-06 | Aktiebolaget Skf | Hub-bearing unit with a sealing device |
EP3078887A1 (en) * | 2015-04-07 | 2016-10-12 | Freudenberg Sealing Technologies S.A.S Di Externa Italia S.R.L.U | A gasket |
US9651155B2 (en) | 2015-04-07 | 2017-05-16 | Freudenberg Sealing Technologies S.A.S. Di Externa Italia S.R.L.U | Gasket |
US10458237B2 (en) * | 2015-10-22 | 2019-10-29 | Nidec Motor Corporation | Sealing sleeve for geared shaft of gearmotor assembly |
US10634213B2 (en) | 2016-04-27 | 2020-04-28 | Nok Corporation | Sealing structure with damper and oil seal |
US10457095B2 (en) | 2016-10-24 | 2019-10-29 | Aktiebolaget Skf | Hub-bearing assembly for a vehicle wheel |
FR3116091A1 (en) * | 2020-11-06 | 2022-05-13 | Ntn-Snr Roulements | Rolling bearing |
Also Published As
Publication number | Publication date |
---|---|
DE112008003600T5 (en) | 2010-10-28 |
DE112008003600B4 (en) | 2021-08-12 |
JP2009144761A (en) | 2009-07-02 |
CN101883941A (en) | 2010-11-10 |
WO2009075199A1 (en) | 2009-06-18 |
JP5218735B2 (en) | 2013-06-26 |
US8573601B2 (en) | 2013-11-05 |
CN101883941B (en) | 2014-07-16 |
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